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Communications in a Cluster: Heartbeat Mechanism
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In a sense, the status of a Nebula Graph cluster is determined by a heartbeat mechanism. This article introduces the heartbeat mechanism through which the servers in a Nebula Graph cluster communicate with each other.
The heartbeats mentioned in this article refer to the heartbeat messages periodically sent by nebula-graphd servers and nebula-storaged servers to nebula-metad servers.
The heartbeat response sent by nebula-metad servers to nebula-graphd servers and nebula-storaged servers contains the last_update_time information, which informs the last update time of the metadata. When the information is updated, nebula-graphd servers and nebula-storaged servers will send a heartbeat request to nebula-metad servers for the updated information of the graph space, the schema, and the configurations.
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